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Elmer Yale Dawson (March 31, 1918 – June 22, 1966) was an American botanist, phycologist, taxonomist, ecologist, and naturalist writer. He popularized science and natural history with his books and articles on topics ranging from California cacti and North American cacti, to California seashore plants and marine algae, desert plant ecology, salt marsh wetlands, and anthropology topics including ethnohistory and ethnobiology of Seri Native American Indian culture of the northern Gulf of California.